Apparatus for forming flat weft loops for a nonwoven netting



2 April 14, 1970 H. SERVAGE 3,505,712

APPARATUS FOR FORMING FLAT WEFT LOOPS FOR A NONWOVEN NETTING OriginalFiled Jan. 27, 1965 lnuen/or Hen 0-; Se!" z aga p By Attorneys UnitedStates Patent 0 rm. (:1. D02g 3/00,- D0411 3/08 US. Cl. 281 6 ClaimsABSTRACT OF THE DISCLOSURE The invention relates to an apparatus forforming flat weft loops in the manufacture of nonwoven netting. A shaftcarries on its axis at least two tubular members which extend radiallyoutwardly from the shaft for rotation therewith. The yarn from eachbobbin is guided through a separate one of said tubular members and, asthe latter rotate, at least two flat weft loops are formed on guide barswhich are spaced apart but located radially inwardly of the open ends ofthe tubular members.

The present invention relates to a method and apparatus for themanufacture of nonwoven netting.

Application Ser. No. 770,885 is a continuation of application Ser. No.428,359, filed J an. 27, 1965, now abancloned.

In a known method and apparatus for the manufacture of nonwoven nettingsas described in French Patent No. 1,208,968 and addition No. 79,765thereto, a web of flattened loops parallel to the weft thread isproduced by a rotating element, these loops being immediately aftertheir formation enclosed between two webs of warp threads and attachedto them. These nonwoven nettings may be used as reinforcements instratified materials. The rotary element may be a tubular member,rotating on a hollow support shaft which serves as a feeder for the weftthread, and winds the latter into loops about a pair of spaced apartsupport arms.

According to the present invention, there is provided an apparatus forforming the flat weft loops for .a non woven netting such apparatuscomprising a rotatable shaft with at least two bobbins mounted coaxiallyon the shaft, the shaft carrying at least two tubular bent membersthrough each of which a thread may be passed, a pair of spaced apartstationary guide bars being positioned nearer to the axis of the shaftthan the tubular bent members so that on rotation of the shaft and themembers at least two series of flat weft loops are formed on the guidebars.

The apparatus of the invention is much superior to the known apparatushaving a heavy rotating circular rim carrying two or more bobbins,because of the moving masses, rotating with considerable inertia and atconsiderable distance from the axis. In the present apparatus, therotating masses are positioned in the axis itself and the inertia of therotating members may be kept low.

In order that the invention may more readily be understood the followingdescription is given of one example of apparatus according to theinvention. Reference is made to the accompanying drawing in which thesole figure is a plan view of the apparatus.

Referring to the drawing, two bobbins 18 are positioned co-axially intwo supports 19 mounted on cages 16. The two cages 16 form an axialframe attached to a rotating shaft 21, mounted, in a bearing 20, and intwo bearings 4.

The cages 16 are each traversed by a bar 17 with a hole 17' in thecentre. A thread 2 or 1 unwinds from each bobbin 18 and passes throughthe holes 17 of the two bars. Beyond the hole 17' in the bar 17 of theleft hand cage the thread 2 passes through an orifice 24 in the lateralbar, follows this bar to the right hand cage, passes back through thebar at 25 and passes through an orifice 23 in the end bar at the frontof the right hand cage.

On the other hand, the thread 1, unwinding from a bobbin in the righthand cage passes through the hole 17' in the bar 17, and then directlythrough an orifice 22 in the end bar of the right hand cage.

The shaft 21 is pierced by two longitudinal, symmetrical passages 26"and 27" with lateral openings 26 and 27 upstream and 26' and 27'downstream. The thread 1 passes through the passage 26" between theopenings 26 and 26', and the thread 2 passes through the passage 27"between the openings 27 and 27.

The shaft 21, which is driven by means of a transmission pulley 3,carries two opposite arms 5 and 6 which carry tubular bent member 7 and7' which guide the threads 1 and 2. The shaft also carries, beyond thearms 5 and 6, a beam 8, 8' which is held in the horizontal position bysuitable means. The shaft 21 can rotate for this purpose in the hub 9 ofthe beam.

The beam 8, 8 is provided with two bent guide bars 11 and 11', the endportions of which converge. The beam also carries two symmetricalbobbins 13, 13 from which two edge threads 28 and 28 unwind and passthrough the two guides 12, 12', symmetrically arranged on the beam 8,8'.

The two bent bars guide the edge threads 28 and 28 towards a deviceconsisting of a pair of rollers 14. The lower roller is directlyunderneath the upper roller and thus cannot be seen in the drawing.

A web of warp threads, not illustrated, is fed from above to the nip ofthe rollers 14, another web of warp threads, not illustrated, is fedfrom below to the nip of the rollers 14.

During rotation of the shaft 21 and of the members 7, 7 the threads 1and 2 form fiat successive loops on the bars 11 and 11' and sliding overthe converging end portions these loops fall onto the edge threads 28,28' which carry them away between the two webs of warp threads and intothe rollers where the two webs of warp threads are attached to the loopsof the weft, so that when the assembly is dried a nonwoven, glue nettingfor reinforcing stratified articles is formed.

That which is claimed is:

1. Apparatus for forming flat weft loops, for a nonwoven netting, saidapparatus comprising, in combination:

(a) a shaft mounted for rotation about its axis;

(b) means on said shaft for mounting at least two bobbins on said shaftaxis;

(c) at least two tubular members, each extending radially outwardly fromsaid shaft, for rotation therewith;

(d) an open end to each of said tubular members spaced radiallyoutwardly from said shaft axis;

(e) guide means for guiding a thread from each of said bobbins to saidtubular members; and

(f) spaced apart guide bar means located radially inwardly of said openends of said tubular member, whereby, upon rotation of said shaft andtubular members, at least two fiat weft loops are formed on said guidebar means.

2. Apparatus as specified in claim 1 and including a multiple framesecured to said shaft effective to form at least two cages eachconstituting said bobbin mounting means.

3. Apparatus as specified in claim 2 in which said multiple framecomprises:

(a) a pair of longitudinal bars substantially parallel to said shaft;

(b) a transverse crossbar extending between said longitudinal bars foreach said bobbin; and

(0) each said crossbar including means defining an aperture for thepassage of a thread from a bobbin.

4. Apparatus as specified in claim 1, said shaft including meansdefining a plurality of longitudinal bores therethrough, each bore beingeffective to lead a thread from a bobbin to the associated tubularmember.

5. Apparatus for forming flat weft loops, for a nonwoven netting, saidapparatus comprising, in combination:

(a) a shaft mounted for rotation about its axis;

(b) means on said shaft for mounting at least two bobbins on said shaftaxis;

(c) at least two guide members, each extending radially outwardly fromsaid shaft, for rotation therewith;

(d) guide means for guiding a thread from each of said bobbins to saidguide members; and

(e) spaced apart guide bar means located radially inwardly of the endsof said guide member, whereby, upon rotation of said shaft and guidemembers, at least two flat weft loops are formed on said guide barmeans.

6. Apparatus as specified in claim 5 and including a multiple framesecured to said shaft effective to form at least two cages eachconstituting said bobbin mounting means.

References Cited UNITED STATES PATENTS 3,154,452 10/1964 Hartbauer156-178 2,847,056 8/1958 Vanlaer 156-4'33 XR PHILIP DIER, PrimaryExaminer US. Cl. X.R. 156-181, 430, 441

